/*
Copyright 2018 Google LLC

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package framework

import (
	"context"
	"fmt"
	"time"

	"github.com/pkg/errors"
	appsv1 "k8s.io/api/apps/v1"
	apierrors "k8s.io/apimachinery/pkg/api/errors"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/util/wait"
	"k8s.io/apimachinery/pkg/util/yaml"
	"k8s.io/client-go/kubernetes"
)

func MakeDeployment(pathToYaml string) (*appsv1.Deployment, error) {
	manifest, err := PathToOSFile(pathToYaml)
	if err != nil {
		return nil, err
	}
	deployment := appsv1.Deployment{}
	if err := yaml.NewYAMLOrJSONDecoder(manifest, 100).Decode(&deployment); err != nil {
		return nil, errors.Wrap(err, fmt.Sprintf("failed to decode file %s", pathToYaml))
	}

	return &deployment, nil
}

func CreateDeployment(kubeClient kubernetes.Interface, namespace string, d *appsv1.Deployment) error {
	_, err := kubeClient.AppsV1().Deployments(namespace).Create(context.TODO(), d, metav1.CreateOptions{})
	if err != nil {
		return errors.Wrap(err, fmt.Sprintf("failed to create deployment %s", d.Name))
	}
	return nil
}

func DeleteDeployment(kubeClient kubernetes.Interface, namespace, name string) error {
	d, err := kubeClient.AppsV1().Deployments(namespace).Get(context.TODO(), name, metav1.GetOptions{})
	if err != nil {
		return err
	}

	zero := int32(0)
	d.Spec.Replicas = &zero

	d, err = kubeClient.AppsV1().Deployments(namespace).Update(context.TODO(), d, metav1.UpdateOptions{})
	if err != nil {
		return err
	}
	return kubeClient.AppsV1().Deployments(namespace).Delete(context.TODO(), d.Name, metav1.DeleteOptions{})
}

func WaitUntilDeploymentGone(kubeClient kubernetes.Interface, namespace, name string, timeout time.Duration) error {
	return wait.Poll(time.Second, timeout, func() (bool, error) {
		_, err := kubeClient.
			AppsV1().Deployments(namespace).
			Get(context.TODO(), name, metav1.GetOptions{})

		if err != nil {
			if apierrors.IsNotFound(err) {
				return true, nil
			}

			return false, err
		}

		return false, nil
	})
}
